![The Number Jumbler](/sites/default/files/styles/medium/public/thumbnails/content-id-14314-icon.jpg?itok=lmDl3Y1w)
problem
The Number Jumbler
The Number Jumbler can always work out your chosen symbol. Can you work out how?
![Your number is...](/sites/default/files/styles/medium/public/thumbnails/content-id-2289-icon.jpg?itok=SZLTZLga)
problem
Your number is...
Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?
![Special Numbers Poster](/sites/default/files/styles/medium/public/thumbnails/content-id-8015-icon.png?itok=vkFgHaR-)
![Special Numbers](/sites/default/files/styles/medium/public/thumbnails/content-02-08-penta3-icon.png?itok=Z7DZGoxN)
problem
Special Numbers
My two digit number is special because adding the sum of its digits to the product of its digits gives me my original number. What could my number be?
![Number Pyramids](/sites/default/files/styles/medium/public/thumbnails/content-id-2281-icon.png?itok=TJcIsRL4)
problem
Number Pyramids
Try entering different sets of numbers in the number pyramids. How does the total at the top change?
![Crossed Ends](/sites/default/files/styles/medium/public/thumbnails/content-id-6261-icon.png?itok=w601cT6o)
problem
Crossed Ends
Crosses can be drawn on number grids of various sizes. What do you notice when you add opposite ends?
![Perimeter Expressions](/sites/default/files/styles/medium/public/thumbnails/content-id-7283-icon.jpg?itok=-UMkUn_O)
problem
Perimeter Expressions
Create some shapes by combining two or more rectangles. What can you say about the areas and perimeters of the shapes you can make?
![Quadratic Patterns](/sites/default/files/styles/medium/public/thumbnails/content-id-11011-icon.png?itok=Gz1WPuzi)
problem
Quadratic Patterns
Surprising numerical patterns can be explained using algebra and diagrams...
![Reversals](/sites/default/files/styles/medium/public/thumbnails/content-id-11118-icon.png?itok=xcA6AvTn)
![Fibonacci Surprises](/sites/default/files/styles/medium/public/thumbnails/content-id-11164-icon.png?itok=MkOhkYT5)
problem
Fibonacci Surprises
Play around with the Fibonacci sequence and discover some surprising results!
![The Simple Life](/sites/default/files/styles/medium/public/thumbnails/content-id-13207-icon.jpg?itok=4IM1SVSH)
![Think of Two Numbers](/sites/default/files/styles/medium/public/thumbnails/content-03-05-penta2-icon.gif?itok=XIhHPBGZ)
problem
Think of Two Numbers
Think of two whole numbers under 10, and follow the steps. I can work out both your numbers very quickly. How?
![More Number Pyramids](/sites/default/files/styles/medium/public/thumbnails/content-id-2282-icon.png?itok=cOeJ9xeH)
problem
More Number Pyramids
When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...
![Always a multiple?](/sites/default/files/styles/medium/public/thumbnails/content-id-7208-icon.png?itok=fjSKmic9)
problem
Always a multiple?
Think of a two digit number, reverse the digits, and add the numbers together. Something special happens...
![Harmonic Triangles Poster](/sites/default/files/styles/medium/public/thumbnails/content-id-4745-icon.png?itok=oF7Frznp)
Image
![Creating and Manipulating Linear and Quadratic Expressions - Stage 3 STEM footer Creating and Manipulating Linear and Quadratic Expressions - Stage 3 STEM footer](/sites/default/files/styles/large/public/thumbnails/content-id-13482-STEMlogo.png?itok=Un7svFK4)
You may also be interested in this collection of activities from the STEM Learning website, that complement the NRICH activities above.